// Roman numerals.  Everybody’s done this, right?
#include <stdlib.h>
#include <stdio.h>

struct segment {
  int val;
  char *rep;
} romans[] = {{1000, "M"}, {900, "CM"}, {500, "D"}, {400, "CD"},
              {100, "C"}, {90, "XC"}, {50, "L"}, {40, "XL"},
              {10, "X"}, {9, "IX"}, {5, "V"}, {4, "IV"}, {1, "I"}};

int main(int argc, char **argv)
{
  int n = atoi(argv[1]);
  for (struct segment *p = romans; n > 0; p++) {
    while (n >= p->val) n -= p->val, printf("%s", p->rep);
  }
  printf("\n");
  return 0;
}